Jonathan H. Marsh, MD
Hematology & Oncology Physician · Palmer, MA
Jonathan H. Marsh, MD is a hematology & oncology physician with a practice address in Palmer, Massachusetts, and NPI 1225031354, issued on May 23, 2005. Check the license (Massachusetts 261665, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Jonathan H. Marsh
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 261665 MA
Self-reported in NPPES; status is on the state search - Practice location
- 40 Wright St, Palmer, MA 01069
- Phone
- (413) 284-5400
- Enumerated
- May 23, 2005
- Record last updated
- Nov 28, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (413) 284-5559
- Medicare enrollment
- Enrolled (PECOS I20150323002187); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 461 in Massachusetts → Look up another NPI →
Also registered at 40 Wright St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jonathan H. Marsh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 261665Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
97 Medicare Part D claims for 30 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Anastrozole13 claims
- Hydroxyurea13 claims
- Retacrit12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $18.09
1 payment: education; the largest payer was Merck Sharp & Dohme LLC. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Baystate Medical Practices IncSpringfield, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan H. Marsh among 461 hematology & oncology physician records in Massachusetts
Jonathan H. Marsh, MD is one of 461 hematology & oncology physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1986 · median 2004 among the 303 with a school on file
- Record last updated2016 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in Massachusetts
There are 461 hematology & oncology physician records in Massachusetts.
All 461 in Massachusetts → Every provider in Palmer → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Lindsay Rockwell, D.O.Florence, MA 010621043277288
- George Bowers, M.D.Northampton, MA 010601629068119
- Alys Malcolm, M.D.Northampton, MA 010601023111531
- Sean Mullally, M.D.Northampton, MA 010601427099001
- Barrett Newsome, DONorthampton, MA 010601932293479
- Ahmad Siddiqui, MDNorthampton, MA 010601700873783
- Renuka Dulala, MDHolyoke, MA 010401861652240
- Alicia Ross, MDHolyoke, MA 010401316020829
Common questions
What is Jonathan H. Marsh, MD's NPI number?
Jonathan H. Marsh, MD's National Provider Identifier (NPI) is 1225031354, issued on May 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan H. Marsh, MD located?
The NPPES record lists a practice address at 40 Wright St, Palmer, MA, 01069. Phone: (413) 284-5400. Providers update this record themselves, so call before visiting.
How can I verify Jonathan H. Marsh, MD's license?
NPPES lists Massachusetts license number 261665, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jonathan H. Marsh, MD prescribe under Medicare Part D?
In 2024, Jonathan H. Marsh, MD had 97 Medicare Part D claims for 30 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.